Rotary motor.



W. S. ELLIOTT. ROTARY MOTOR.

nrrmou'ron FILED 00114. 1908.

Patented Jan 31,1911.

. a. w m VA m I K v wtnnreis s. armors, or rrr'rsiw'ae, PENNSYLVANIA.

ESTER? 18101303.

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Specification of Letters Patent. Patented Jan. 31, 1911..

Application filed time 1.4, 1968, serial no. 457,657.

Toall whom it may concern: i

Be it known that I, W'ILLIA'M S. ELLIOTT, of Pittsburg, Allegheny county, Pennsylvania, have invented a new and useful limprovement in Rotary Motors, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, in which Figure 1 is a. longitudinal section; and Fig. 2 is a cross-section of a motor embodying my invention, the section of Fig. 2 being 'taken on the line HII of Fig. 1.

My invention has relation to rotary motors and is designed to provide a motor of this type which is simple in its construction and which can be readily assembled and taken apart; to provide novel means for insuring efficient lubrication of the piston journals; to provide means for preventing wear of the piston blade; and to ii'nprovc'thc construction of various details of the motor, all as hereinafter described.

The motor shown in the accompanying drawings has been more particularly designed for use in operating boiler tube cleaning tools, it being adapted for being carried through the tubes to be cleaned with the cleaning tool, but it may be used for a variety of other purposes.

The precise nature of my invention will be best understood by reference to the accompanying drawings which will now be described, it being premised, however that various changes may be made inthe details of construction and arrangement of the parts without departing from the spirit and scope of the invention as defined in the appended claims.

In these drawings, the numeral 2 desig nates the cylinder'of the motor having the eccentrically located piston chamber 3 extending entirely through the cylinder. In the thickened Wall of the cylinder is the longitudinally extending admission port 4 .and the longitudinally extending exhaust- -port 5. Each of these ports 4. and 5 coinmunica-tes with the interior of the chamber 3 by a plurality of cross ports ththis arrangement of the ports providing for a uniform admission of pressure throughout the length of the cylinder and for its rapid exhaust therefrom. The cylinder 2 is seated between the cylindrical front and rear heads 7 and 8, these heads being pretcrablyof considerably larger diameter than the diameter of the cylinder and being provided with the recesses 9 within which the end portions of the cylinder are seated. The parts are preferabl y secured together by means of the long screws 10 which extend through the front head and through the wall of the cylinder into the rear head.

The rear head 8 is provided with a rearward extension beyond the rear end of the head proper and which is formed with one or more inlet ports 12 which communicatewith the admission port l of the cylinder around the piston shaft. of the motor. The end oi the extension 11 is provided with an interiorily threaded socket 13 for connection thereto of a flexible supply pipe or hose 1%. l5, designates the piston shaft having a portion 16 of enlarged diameter within the piston chamber 3 and having a slot extend-- ing diametrically therethrough to receive the piston blade 17. This blade may be of any suitable construction, being shown as composed of two abutting and interlitting sections arranged to slide one upon the other to maintain contact at all times between their ends and the wall of the chamber 3.

The forward end of the shaft 15 extends through the trout head 7 and is provided with a screw-threadcal shank 18 or other suitable means, to receive the cleaning tool or other part to be operated by the motor. The piston shaft is journaled in the shouldered or flanged bushings 19 which are seated within the respective heads 7 and 8, said heads l'ieing shouldered or rabbcted as indicated at 20 to receive the flanges of the bushings. The shoulders 16 on the piston shaft abut directly against the flanges at the inner ends of the respective bushings 19, and thus form thrust bearings for the shaft. The rear journal portion 21 of the piston shaft is shown of somewhat smaller diameter than the forward journal portion and as extending entirely through its bush ing, the end of the bushing and of the journal being separated from the extension 11 by an intervening space 22. Surrounding each end of the enlar ed portion 16 of the piston shaft is a hardened annular ring 23. These rings have bearings against the inner ends of the bushings 19, the purpose of these rings being to prevent wear between the ends of the piston blades and the bushings, since all wear will be taken up by the rings instead of by the bushings.

The rings also f effectually close the piston chamber against any leaka e of the motive fiuid around the piston bla ie.

The motor is especially adapted for use 1 with steam or compressed air as a motive fluid, and the piston chamber, together with the piston bearings are kept efliciently lu-- bricated by applying lubricant into the chamber 3 with the incoming air. The pressure of'the air in the chamber 3 will force some of this lubricant outwardly along the journal portions of the piston shaft, there being a slight leakage of air the cylinder against injury. In practice these heads will preferably be made of softer steel than the cylinder which must be of hard steel and can therefore be readily turned down when worn and used in smaller tubes. By using the long screws 10 for securing the parts together, these screws being tapped into the rear head 8, I avoid the necessity for threading the screw seats in the cylinder wall. By removing the screws the motor can be readily taken apart a for the purpose of renewing the bushings,

secured in any suitable manner.

or the piston blade, or for any other desired purpose. I do not, however, limit myself to this method of securing the parts together, since the cylinder heads may be Various other changes can be made in the details of construction and arrangement of the parts without departing from the spirit and scope of my invention.

What I claim is z- 1. A rotary motor, comprising a cylinder, end heads between which the cylinder is secured, a piston shaft having a central portion of enlarged diameter, said portion beesaoes ing longer than the cylinder and extending into the heads, and the shaft having a journal portion of reduced diameter at each ring or collar seated on each end portion of the piston between the flanges of the ad jacent bushing and the end of the cylinder; substantially as described.

3. In a rotary motor, a cylinder having a longitudinally extending admission port in its wall, front and rear heads between which the cylinder is secured, bushings in said heads, and a piston shaft extendin entirely through both heads, the rear ead having an overhung neck or extension separated by a space from the rear exposed end of the piston shaft, said'extensi'o'n having an admission port entering its rear end in line with the shaft, and thence leading around the end of the shaft to meet the admission port in the cylinder wally substantially as described.

4. In a rotary motor,-a cylinder having an admission port in its wall, heads secured to the cylinder, a piston shaft journaled in said heads, the rear head having an admission extension formed with a port which communicates with the port in thecylinder wall, said extension being separated from: the shaft-bearing portion of the rear head by an open space, and the piston shaft extending through its'bearing to said space; substantially as described. Y

In testimony whereof," I have hereunto set my hand. VILLIAM S..ELLIOTT.

Witnesses:

GEO. B. BLEMING', H. M..CORWIN." 

